The RSF-1588.655-4000-1411-TR-NS1 from Raltron is a Band Pass Filter with Frequency 1586.655 to 1590.655, Bandwidth 4 MHz, Center Frequency 1588.655 MHz, Insertion Loss 1.5 dB, Upper Rejection 30 to 40 dB. Tags: Surface Mount, RF SAW Filter. More details for RSF-1588.655-4000-1411-TR-NS1 can be seen below.